Atmospheric Pressure – Maharashtra Board Class 8 Solutions for General Science (English Medium)
Pressure depends on the area of the surface on which the force acts. The less the surface area, the greater is the pressure produced. Hence, knives and blades have sharp edges which help us to produce greater pressure on a small area, thus making cutting easier.
Pressure depends on the area of the surface on which the force acts. The greater the surface area, the less is the pressure produced. Hence, ski-boards which are used to glide over snow are long and broad to increase the surface area which reduces pressure on it and thus do not sink in snow.
Ink enters the dropper till the pressure of the air in the dropper becomes equal to atmospheric pressure outside acting on the ink bottle. It is because of these two pressures that the ink does not fall out of the dropper unless the bulb is pressed.
- The unit of pressure is newton per square metre.
- Ink rises into the ink dropper because of the atmospheric pressure acting on the surface of the ink in the bottle.
- When the piston of a pump is pulled up, the pressure inside decreases.
- The air pressure inside our body is equal to the atmospheric pressure.
|a. Fluid substances||2. Equal pressure in all directions|
|b. Sprinkle irrigation||3. Pressure on water|
|c. Blunt weapon||4. Less pressure|
|d. Sharp weapon||1. Greater pressure|
- False. If the area is reduced, pressure increases.